#include<stdio.h>
#define M 100
#define N 
int main()
{
	printf("hello xxhh!,%d\n",M);
//	printf("hello xxhh\n");
//	printf("hello xxhh\n");
	printf("hello xxhh\n");

#ifdef N
	printf("hello N\n");
#else
	printf("hello no N\n");
#endif
	return 0;
}





